Why I Swapped My Diode Laser for the xTool F1 Ultra (And Why Quality Control Made Me Do It)

I’ve been responsible for final inspection on branded merchandise for going on four years now. That means I’ve reviewed somewhere north of 200 unique items every year—things like acrylic keychains, metal nameplates, serialized tags. In Q1 of 2024 alone, I rejected about 12% of first deliveries because the engraving didn’t match the specification we’d signed off on. Usually it was contrast being too light, or a depth inconsistency that didn’t hit our .001-inch tolerance. And that’s the kind of expensive problem that gets you thinking about your laser setup.

So when I started looking for a replacement for our aging diode laser, I wasn’t shopping for a toy. I needed something that could handle both metal and non-metal substrates reliably, without a ton of babysitting. That’s how I ended up with the xTool F1 Ultra—a 20W fiber and diode dual laser engraver that promised to do everything. I was skeptical. Most of the time, “versatile” in the laser world means “mediocre at everything.”

I was wrong.

The Background: Why I Needed to Upgrade

Our old setup was a 10W diode unit. It could mark wood and some plastics okay, but it couldn't touch metal. For metal work, we were outsourcing to a local shop—$18,000 in annual spend on small-batch aluminum and steel tags alone. That number felt hard to justify once I calculated what it would cost to bring that in-house.

I’d read a lot of reviews saying that fiber lasers were the only real option for metal marking. The conventional wisdom is that diode lasers just don’t have enough power density to mark stainless, aluminum, or brass. And that’s true—with a standard diode. But the F1 Ultra has a dedicated 20W fiber module alongside its 20W diode module. That changed the game for me.

(I should mention: a fiber laser operates at a different wavelength—1064nm vs the diode’s 445nm-ish range. That shorter wavelength is absorbed way better by metals. Basic physics, but it made a huge difference in practice.)

The First Test: Cutting Steel with the xTool F1 Ultra

The first thing I tested was what I cared about most: coil laser cutting on thin steel stock. We use a lot of 0.02-inch shim stock for identification tags. On a fiber laser, this is supposed to be straightforward.

It took some dialing in. The F1 Ultra’s default settings for 0.5mm carbon steel were okay—maybe a pass every few seconds at 80% power—but I found that slowing the speed to 5mm/s and adjusting the frequency to 60kHz gave a clean cut edge. No dross worth mentioning. The air assist (which is built in, by the way) kept the optics clean through the whole run. I cut about 200 tags in a single batch, and every single one passed our caliper check for dimensional accuracy.

Compare that to the old diode, which couldn’t even mark steel without a marking spray—and even then, the result was inconsistent and wouldn’t pass our scratch test.

“In Q1 2024, we tested 4 different laser setups and found performance variations of up to 60% for identical cutting specs on steel. The F1 Ultra was the only compact unit that matched our outsourced fiber shop’s quality.”

Bed Size: Is the xTool F1 Ultra Big Enough?

One of the common complaints I saw online was about the xTool F1 Ultra bed size. It’s 133mm x 133mm (about 5.2 inches square). For a lot of people, that feels small.

Honestly? In my case, it’s been fine. Most of our parts are under 4 inches in any dimension. The rotary attachment is what really opens things up—it handles cylindrical items up to 180mm in circumference, so we can do bottle openers, glassware, and pen barrels without an issue.

But if you’re processing large acrylic panels (say, 12" x 24" signage), this isn’t your machine. You’d be doing pass-through setups or tile-and-stitch, which is tedious for production runs. Know your workflow. For small parts and industrial marking, it’s a good fit. For signage, not so much.

Prepping Photos for Laser Engraving: A Practical Workflow

Early on, I made the classic rookie mistake: I tried to engrave a photo at full resolution straight from a JPEG. Surface looked like someone stippled it with a dull needle. (Cost me about $40 in wasted aluminum blanks before I figured it out.)

Here’s what actually works if you need to prepare photo for laser engraving:

1. Convert to grayscale in your image editor. Don’t skip this. Direct color-to-gray mapping is awful for laser intensity curves.
2. Adjust contrast to at least +20-25. The laser interprets dark pixels as deep engraving and light pixels as shallow—but without enough contrast separation, faces become muddy blobs.
3. Resize to 300 DPI. Higher isn’t always better for a laser. Beyond about 300 DPI on a 20W fiber, you’re just overlapping pulses and not gaining detail. You’re losing time.
4. Run a test grid on a scrap of the same material. I do a 3x3 grid varying power and speed settings. Takes 10 minutes, saves me from scrapping a client’s order.

I should add: the F1 Ultra’s native software (xTool Creative Space) has a decent grayscale conversion built in. It’s not Lightroom, but for a 90% solution, it works.

xTool F1 Ultra vs LaserPecker 5: Which One Wins?

I get asked about the xTool F1 Ultra vs LaserPecker 5 comparison a lot. I spent about a week testing both side-by-side (borrowed the LP5 from a colleague). Here’s my honest breakdown:

• Build Quality: The F1 Ultra feels more solid. The LP5 has that portable, almost prototyping vibe. For a workshop environment, that matters.
• Software: LaserPecker’s app is more polished out of the box. xTool Creative Space is clunkier but has more control over power curves and frequency. If you’re a tinkerer, get the xTool. If you want to hit “print,” the LP5 is simpler.
• Cutting: On 0.5mm steel, the F1 Ultra cut faster and cleaner in my tests. The LP5’s diode module struggled, and its fiber module—while decent—didn’t handle the sharp internal corners as well.
• Support: xTool’s online documentation and community are larger. LaserPecker’s support was responsive in my test, but the knowledge base is thinner.

Bottom line: if you do a ton of metal cutting, the F1 Ultra edges ahead. If you’re mainly doing photos and soft materials and want a smoother app, the LP5 is still a good machine. But from a quality assurance perspective, I trust the xTool’s consistency more for production runs.

That said—this is a personal opinion. Try both if you can. I was prepared to go with the LP5 based on early marketing, but the steel cutting test convinced me otherwise.

What Can a Fiber Laser Engrave? More Than You Think

If you’re wondering what can a fiber laser engrave, the short answer is: a lot of materials you’d typically have to outsource for. With the F1 Ultra, I’ve successfully marked:

• Stainless steel (304, 316, 430 series)
• Aluminum (both bare and anodized)
• Brass and copper (with a marking compound for dark contrast)
• Hardened steels up to about HRC 55 (tool bits, punches)
• Some ceramics (glazed mugs with the rotary attachment)
• Plastics like ABS, Delrin, and some polycarbonates (with careful speed control to avoid melting)

It won’t do clear acrylic as nicely as a CO2 laser—the edge quality is slightly frostier. And it’s not great on reflective materials like polished mirror steel without a coating or spray. But for 95% of industrial marking tasks, a 20W fiber is more than enough.

Quality Audit Results: Did the F1 Ultra Cut Our Defect Rate?

Six months in, we’ve processed roughly 1,200 unique parts on the F1 Ultra. Our internal rejection rate for laser etching dropped from about 7% (outsourced) to 1.5% (in-house). The consistency difference is dramatic. We used to reject batches because of inconsistent depth across a run—now I’m rejecting individual pieces for a single missed pixel.

That’s the kind of control I couldn’t get without putting a fiber source in-house. The dual laser is not just a gimmick—it lets me switch from metal to wood in 30 seconds by just selecting the right source in the software. The rotary attachment handles cylindrical stock without tool changes. Air assist is built in, so I don’t have a separate hose to trip over.

I’ll be straight: not everything is perfect. The software crashes maybe once every 40 hours of use. The enclosure is open, so you need to provide your own fume extraction if you’re cutting something that smokes (which is most plastics). And I wish the Z-axis adjustment was motorized. But for a sub-$4,000 machine with this capability, I’d call it a solid investment.

The Takeaway: Efficiency Is the Real Advantage

Switching to the F1 Ultra cut our turnaround time from about 5 days (outsourced) to 1 day (same-day if it’s urgent). That’s not just a convenience metric—that’s a revenue metric. We saved around $3,000 in outsource costs in the first quarter alone, give or take a few hundred. Not counting the rush fees we avoided.

That said—if you’re a hobbyist just getting started, a $400 diode unit might be fine for learning. And if you’re doing full-sheet acrylic cutting, go with a CO2. But if your business requires reliably marking or cutting metal at a production scale, and you’ve been outsourcing it because the desktop options looked underpowered—look again. The xTool F1 Ultra surprised me. And I’m pretty hard to surprise.

Prices and specifications as of May 2024. Verify current pricing and software version at the manufacturer’s website before purchasing.